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Astron. Astrophys. 339, L9-L12 (1998)

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2. Observations

The observations analyzed here were made on 26 September and 6 October 1996 as part of a comprehensive investigation of the infrared spectrum of comet Hale-Bopp with ISO (Crovisier et al. 1997a, 1997b). The full spectral scan (43-195 µm, spectral resolution [FORMULA], field of view [FORMULA]) obtained on 6 October with the Long Wavelength Spectrometer (LWS; Clegg et al. 1996) was re-reduced using the last version (7.0) of the standard pipeline (Fig. 1). The photometer grating spectrometer (PHT-S; Lemke et al. 1996) observed the 2.5-5 µm spectrum (spectral resolution [FORMULA], field of view [FORMULA]) on 26 September and 6 October.

[FIGURE] Fig. 1. LWS data along with model, obtained with ice particle radius [FORMULA] µm, ice temperature [FORMULA] = 170K, [FORMULA] K, [FORMULA] (see text). Solid line: contribution of the ice. Long-dashed line: contribution of the dust. Short-dashed line: sum of the two components. Several rotational lines of gaseous water are observed (and unmodelled) at 108, 175, 180 and (marginally) 101 µm

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© European Southern Observatory (ESO) 1998

Online publication: September 30, 1998